diff --git a/demo/client.ts b/demo/client.ts
index 8dd18da42..692ad8e54 100644
--- a/demo/client.ts
+++ b/demo/client.ts
@@ -553,11 +553,7 @@ function addDecoration() {
   term.options['overviewRulerWidth'] = 15;
   const marker = term.addMarker(1);
   const decoration = term.registerDecoration({ marker, overviewRulerOptions: { color: '#ef2929'} });
-  decoration.onRender((e) => {
-    if (e.classList.value === 'xterm-decoration') {
-      e.style.backgroundColor = '#ef2929';
-    }
-  });
+  decoration.onRender((e) => e.style.backgroundColor = '#ef2929');
 }
 
 function addOverviewRuler() {
diff --git a/src/browser/Decorations/OverviewRulerRenderer.ts b/src/browser/Decorations/OverviewRulerRenderer.ts
index 53f1a99c1..620e4dbbb 100644
--- a/src/browser/Decorations/OverviewRulerRenderer.ts
+++ b/src/browser/Decorations/OverviewRulerRenderer.ts
@@ -15,7 +15,7 @@ import { IBufferService, IDecorationService, IInternalDecoration, IOptionsServic
 const renderSizes = new Uint16Array(3);
 const enum SizeIndex {
   OUTER_SIZE = 0,
-  INNER_SIZE = 0
+  INNER_SIZE = 1
 }
 
 export class OverviewRulerRenderer extends Disposable {
@@ -91,13 +91,14 @@ export class OverviewRulerRenderer extends Disposable {
       this._decorationElements.delete(decoration);
       return;
     }
-    this._ctx.lineWidth = !decoration.options.overviewRulerOptions.position ? 2 : 6;
-    this._ctx.strokeStyle = decoration.options.overviewRulerOptions.color;
-    this._ctx.strokeRect(
+    this._ctx.lineWidth = 1;
+    this._ctx.fillStyle = decoration.overviewRulerOptions?.color || decoration.options.overviewRulerOptions.color;
+    this._ctx.fillRect(
       !decoration.options.overviewRulerOptions.position ||  decoration.options.overviewRulerOptions.position === 'left' ? 0 : decoration.options.overviewRulerOptions.position === 'right' ? renderSizes[SizeIndex.OUTER_SIZE] + renderSizes[SizeIndex.INNER_SIZE]: renderSizes[SizeIndex.OUTER_SIZE],
       Math.round(this._canvas.height * (decoration.options.marker.line / this._bufferService.buffers.active.lines.length)),
-      !decoration.options.overviewRulerOptions.position ? this._width : decoration.options.overviewRulerOptions.position === 'center' ? renderSizes[SizeIndex.INNER_SIZE]: renderSizes[SizeIndex.OUTER_SIZE],
-      window.devicePixelRatio
+      !decoration.options.overviewRulerOptions.position ? this._width : decoration.options.overviewRulerOptions.position === 'center' ? renderSizes[SizeIndex.INNER_SIZE] : renderSizes[SizeIndex.OUTER_SIZE],
+      // when a position is provided, the element has less width, so increase its height
+      window.devicePixelRatio * (decoration.options.overviewRulerOptions.position ? 6 : 2)
     );
   }
 
@@ -120,7 +121,6 @@ export class OverviewRulerRenderer extends Disposable {
       this._decorationElements.set(decoration, this._canvas);
     }
     this._refreshStyle(decoration, updateAnchor);
-    decoration.onRenderEmitter.fire(this._canvas);
   }
 
   private _queueRefresh(updateCanvasDimensions?: boolean, updateAnchor?: boolean): void {
diff --git a/typings/xterm.d.ts b/typings/xterm.d.ts
index 54f4b7d9a..e963a39ae 100644
--- a/typings/xterm.d.ts
+++ b/typings/xterm.d.ts
@@ -434,10 +434,26 @@ declare module 'xterm' {
 
     /**
      * The element that the decoration is rendered to. This will be undefined
-     * until it is rendered for the first time by @{link IDecoration.onRender}.
+     * until it is rendered for the first time by {@link IDecoration.onRender}.
      * that.
      */
     element: HTMLElement | undefined;
+
+    /**
+     * The options for the overview ruler that can be updated.
+     * This will only take effect when {@link IDecorationOptions.overviewRulerOptions}
+     * were provided initially.
+     */
+     overviewRulerOptions?: Pick<IDecorationOverviewRulerOptions, 'color'>;
+  }
+
+
+  /**
+   * Overview ruler decoration options
+   */
+  interface IDecorationOverviewRulerOptions {
+    color: string;
+    position?: 'left' | 'center' | 'right';
   }
 
   /*
@@ -479,7 +495,7 @@ declare module 'xterm' {
      * @param color The color of the decoration.
      * @param position The position of the decoration.
      */
-    readonly overviewRulerOptions?: { color: string; position?: 'left' | 'center' | 'right'}
+    overviewRulerOptions?: IDecorationOverviewRulerOptions
   }
 
   /**